| Robertsville to Smolyan | 4,842.93 mi (7,793.95 km) |
| Robertsville to Sofia | 4,740.70 mi (7,629.42 km) |
| Robertsville to Sopot | 4,800.99 mi (7,726.44 km) |
| Robertsville to Sozopol | 4,930.21 mi (7,934.41 km) |
| Robertsville to Sredets | 4,912.94 mi (7,906.61 km) |
| Robertsville to Stamboliyski | 4,813.35 mi (7,746.35 km) |
| Robertsville to Stara Zagora | 4,846.65 mi (7,799.93 km) |
| Robertsville to Svilengrad | 4,896.98 mi (7,880.93 km) |
| Robertsville to Svishtov | 4,785.55 mi (7,701.59 km) |
| Robertsville to Targovishte | 4,850.24 mi (7,805.70 km) |
| Robertsville to Teteven | 4,770.33 mi (7,677.10 km) |
| Robertsville to Troyan | 4,790.05 mi (7,708.84 km) |
| Robertsville to Tryavna | 4,822.55 mi (7,761.15 km) |
| Robertsville to Tutrakan | 4,818.16 mi (7,754.08 km) |
| Robertsville to Varna | 4,904.79 mi (7,893.50 km) |
